Description: 1.On-board MAX485 chip, A low power consumption for the RS-485 communication, slew-rate limited transceiver. 2. On board then 5.08 (mm) pitch 2P terminal to facilitate RS-485 communication wiring. 3.All pins of chip have been lead to can be controlled throug'h the microcontroller. 4. Working voltage: 5V. 5. Board size: 44 (mm) x14 (mm).